If the circ were too long, the petals wouldn't meet on the other side. Having 2 eliminates this problem.
However, if your circ was REALLY long, it could be done as Magic Loop. If that sounds like your situation, let me know and I can link some pics. I'm using this method right now to knit a pair of socks, and I'm SO happy with the results.
Amy has a video for Magic Loop; just click the "Advanced Techniques" tab at the top of the page.